Gashrooms

Gashrooms are a type of ingredient, confirmed to be in the mushroom family, used in beginner alchemy. After Sophie stole the midterm from Lady Galvin's mind, she was distracted causing her to accidentally spill this mushroomy ingredient. It was described to make the room reek of rotten fungus. It is unknown if this mushroom is actually kept rotten, or if that is just its scent.